Table 3.

Questions Used in System Usability Evaluation

ASPECT	QUESTION
CardioGuard brassiere	Q1. Do you think wearing the bra sensor is as comfortable as a regular brassiere?
	Q2. Do you think wire electrodes can fulfill the function of the existing wires in a regular brassiere?
	Q3. Do you feel comfortable with the touch of the wire electrodes?
	Q4. Do you feel uncomfortable because of the size of the sensor device?
	Q5. Do you feel uncomfortable because of the weight of the sensor device?
System usefulness	(After an explanation of some examples of the healthcare applications, including sleep analysis, emotion detection, stress analysis, and the detection of cardiac diseases that are based on heart rate and heart rate variability, that could be possible with the proposed sensor system)
	Q6. Do you think those healthcare applications with the proposed sensor system are useful for management of your health?
	Q7. Are you willing to wear our sensor system in daily life if those applications are provided?